I went through my trade list. I noticed these at
$0.00:
Barter in Blood (Avacyn Restored)
Smother (Worldwake)
Mayor of Avabruck (Innistrad)
Isperia, Supreme Judge (Return to Ravnica)
Aegis Angel (m12)
Vapor Snag (New Phyrexia)
Kird Ape (9th Edition)
Boros Garrison (Ravnica)
Boros Signet (Ravnica)
Browbeat (Time Spiral - Timeshifted)
Dimir Aqueduct (Ravnica)
Dimir Signet (Ravnica)
Golgari Rot Farm (Ravnica)
Golgari Signet (Ravnica)
Selesnya Signet (Ravnica)
Selesnya Sanctuary (Ravnica)
Abjure (Weatherlight)
Boros Guildgate (Dragon's Maze)
Nested Ghoul (Mirrodin Besieged)
Arbor Elf (M13)
Elvish Mystic (M14)
Sadistic Hypnotist (Odyssey)
Boros Battleshaper (Dragon's Maze)
Abhorrent Overlord (Theros)
Ancient Grudge (Innistrad)
Forbidden Alchemy (Innistrad)
Predatory Urge (Zendikar)
Tunnel Ignus (Scars of Mirrodin)
Celestial Purge (M12)
Eye of Nowhere (Champions of Kamigawa)
Flow of Ideas (Ravnica)
Gladecover Scout (M14)
Lavinia of the Tenth (Dragon's Maze)
Mwonvuli Beast Tracker (M13)
Phyrexian Rager (Mirrodin Besieged)
Pyxis of Pandemonium (Theros)
Abandoned Outpost (Odyssey)
Amoeboid Changeling (Lorwyn)
Arachnus Spinner (m12)
Bojuka Bog (Worldwake)
Hypersonic Dragon (Return to Ravnica)
Mercurial Chemister (Return to Ravnica)
Selesnya Guildgate (Dragon's Maze)
Tower of Calamities (Scars of Mirrodin)
Wirewood Herald (Onslaught)
Evolving Wilds (m13)
Fireball (m12)
Terramorphic Expanse (m11)
Touch of the Eternal (M13)
Gravedigger (m12)
Llanowar Elves (m12)
Crystal Ball (m11)
Mana Leak (m12)
Duress (m14)
Anthousa, Setessan Hero (Theros)
Korozda Guildmage (Return to Ravnica)
Naturalize (m14)
Ooze Flux (Gatecrash)
Albino Troll (DD: Garruk vs. Liliana)
Alchemist's Refuge (Avacyn Restored)
Acidic Slime (m13)
Argent Sphinx (Scars of Mirrodin)
Beguiler of Wills (Dark Ascension)
Debt to the Deathless (Dragon's Maze)
Faith's Fetters (Ravnica)
Sire of Insanity (Dragon's Maze)
Vengeful Pharaoh (m12)
Stormtide Leviathan (m13)
Mogg War Marshal (Time Spiral)
Condemn (m11)
Dissipate (Innistrad)
Dragonshift (Dragon's Maze)
Rampant Growth (m12)
Hundred-Handed One (Theros)
Bant Panorama (Shards of Alara)
Melek, Izzet Paragon (dragon's Maze)
Doom Blade (M11)
Akoum Refuge (Zendikar)
Armament Master (Zendikar)
Emmara Tandris (Dragon's Maze)
Corrupted Zendikon (Worldwake)
Grapeshot (Time Spiral)
Bestial Menace (Worldwake)
Vengeful Archon (m11)
Council of the Absolute (Dragon's Maze)
Counterflux (return to ravnica)
Firemane Avenger (Gatecrash)
Chained to the Rocks (Theros)
Contagion Clasp (Scars of Mirrodin)
Hypersonic Dragon (Return to Ravnica)
Boundless Realms (m13)
Witchbane Orb (Innistrad)
Ponder (m12)
Imposing Sovereign (M14)
Consume Spirit (Xth edition)
Diabolic Tutor (m14)
Crown of Empires (m12)
Great Sable Stag (m10)
Wellwisher (onslaught)
Nefarox, Overlord of Grixis (m13)
Magma Jet (Fifth Dawn)
Call of the Conclave (Return to Ravnica)
Angel of Jubilation (Avacyn Restored)
Ancient Den (Mirrodin)
Pathrazer of Ulamog (Rise of the Eldrazi)
Whip of Erebos (Theros)
Underworld Connections (Return to Ravnica)
Cosi's Trickster (Zendikar)
Disenchant (Time Spiral)
Angelic Overseer (Innistrad)
Cranial Plating (Fifth Dawn)
Jace's Phantasm (m13)
Tempered Steel (Scars of Mirrodin)
Advent of the Wurm (Dragon's Maze)
Sword of Vengeance (m11)
Goblin Chieftain (m12)
Ezuri, Renegade Leader (Scars of Mirrodin)
Signal Pest (Mirrodin Besieged)
Liliana's Caress (m11)
Chandra Nalaar (m11)
Joraga Treespeaker (Worldwake)
Elves of the Deep Shadow (Ravnica)
foil Elves of the Deep Shadow (Ravnica)
foil Joraga Treespeaker (Worldwake)
foil Chandra Nalaar (m11)
foil Fireball (m11)
foil Liliana's Caress (m11)
foil Signal Pest (Mirrodin Besieged)
foil Ezuri, Renegade Leader (Scars of Mirrodin)
foil Goblin Chieftain (m12)
foil Sword of Vengeance (m11)
foil Tempered Steel (Scars of Mirrodin)
foil Jace's Phantasm (M13)
foil Cranial Plating (Fifth Dawn)
foil Angelic Overseer (innistrad)
foil Disenchant (Time Spiral)
foil Cosi's Trickster (Zendikar)
foil Underworld Connections (Return to Ravnica)
foil Whip of Erebos (theros)
foil Pathrazer of Ulamog (Rise of the Eldrazi)
foil Ancient Den (Mirrodin)
foil Sedraxis Specter (Shards of Alara)
foil Angel of Jubilation (Avacyn Restored)
foil Negate (m11)
foil Demonic Dread (Alara Reborn)
foil Call of the Conclave (return to Ravnica)
foil Magma Jet (Fifth Dawn)
foil Nefarox, Overlord of Grixis (m13)
foil Ardent Plea (Alara Reborn)
foil Faerie Mechanist (conflux)
foil Flames of the Blood Hand (PDS: Fire and Lightning)
foil Crown of Empires (m12)
foil Verdant Force (Graveborn)
foil Flowering Lumberknot (Avacyn Restored)
foil Witchbane Orb (Innistrad)
foil Boundless Realms (m13)
foil Hypersonic Dragon (Return to Ravnica)
foil Contagion Clasp (Scars of Mirrodin)
foil Mind Control (M12)
foil Multani's Acolyte (Urza's Legacy)
foil Counterflux (return to ravnica)
foil Firemane Avenger (Gatecrash)
foil Celestial Purge (m11)
foil Memory Sluice (shadowmoor)
foil Council of the Absolute (Dragon's Maze)
foil Treacherous Link (Urza's Legacy)
foil Vengeful Archon (m11)
foil Devout Harpist (Urza's Legacy)
foil Brink of Madness (Urza's Legacy)
foil Bestial Menace (Worldwake)
foil Cancel (m12)
foil Corrupted Zendikon (Worldwake)
foil Knighthood (Urza's Legacy)
foil Sprouting Thrinax (Shards of Alara)
foil Feeling of Dread (Innistrad)
foil Markov Patrician (Innistrad)
foil Corpsehatch (Rise of the Eldrazi)
foil Demon's Horn (m11)
foil Flashfreeze (m11)
foil Soul's Grace (Shards of Alara)
foil Sewn-Eye Drake (Alara Reborn)
foil Travel Preparations (Innistrad)
foil Esper Sojourners (Alara Reborn)
foil Canyon Minotaur (m11)
foil Dead Weight (Innistrad)
foil Filigree Fracture (Conflux)
foil Auriok Edgewright (Scars of Mirrodin)
foil Cloistered Youth (Innistrad)
foil Etherium Abomination
foil Serra Angel (M10)
foil Contagion Clasp (Scars of Mirrodin)
foil Blister Beetle (Shards of Alara)
foil Demolish (zendikar)
foil Shadowfeed (Shards of Alara)
foil Vedalken Outlander (Conflux)
These are at
$0.01 (commons may be fine but figured I'd list them as well):
Nihil Spellbomb (Scars of Mirrodin)
Prismatic Lens (Time Spiral)
Seal of Primordium (Planar Chaos)
foil Gleam of Resistance (Conflux)
Values too high I noticed:
Shambling Shell (Ravnica) $49.99 - shows a theme deck for sale when viewing link
Negate (m11) $1.73 (too high)
Seal of Strength (Nemesis) $2.12 - foil is $1.38, normal is $2.12
Cultivate (m11) $4.71
Fireball (m11) $2.59